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Siemens 3RT2028-1FB44-3MA0 38A DC Contactor with Diode

Siemens 3RT2028-1FB44-3MA0 3-Pole Power Contactor with Diode

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ManufacturerSiemens

Part number3RT2028-1FB44-3MA0

Type Power Contactor

AC-3e/AC-3 Rating 38 A

Power Rating 18.5 kW / 400 V

Poles 3

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24V DC coil Integrated diode for surge suppression 38A AC-3e/AC-3 rating 2 NO + 2 NC auxiliary contacts Captive auxiliary switch Size S0

Product description

The Siemens 3RT2028-1FB44-3MA0 is a 3-pole power contactor suitable for AC-3e/AC-3 duty, with a 38A rating and 18.5 kW power capacity at 400V. It operates on a 24V DC coil and incorporates a built-in diode combination for surge suppression. This model is equipped with 2 normally open (NO) and 2 normally closed (NC) auxiliary contacts, plus a captive auxiliary switch for enhanced reliability.

This contactor is designed for applications demanding DC control voltage and integrated coil protection, common in automated machinery and control systems. The inclusion of 2 NO and 2 NC auxiliary contacts provides ample capacity for complex control and interlocking circuits. Its S0 size and screw terminals ensure easy installation within standard industrial enclosures.

Stanlo Automation, a veteran-owned surplus industrial parts distributor, is your source for the Siemens 3RT2028-1FB44-3MA0. We deliver reliable components and expert support to minimize downtime and optimize your automation infrastructure.

Technical specifications

Type	Power Contactor
AC-3e/AC-3 Rating	38 A
Power Rating	18.5 kW / 400 V
Poles	3
Coil Voltage	24 V DC
Diode Combination	Integrated
Auxiliary Contacts	2 NO + 2 NC
Terminals	Screw
Size	S0
Captive Auxiliary Switch	Yes

Common applications

Motor control

DC controlled automation

Industrial automation

Control panels

Power switching

Machine tools

Compatible systems

Siemens Sirius 3RT Series Control systems requiring 24V DC coil voltage and 2 NO/2 NC auxiliary contacts

Also known as

Siemens 3RT2028 DC Contactor Diode 3RT2028 Contactor 24V DC Siemens Sirius 3RT

Replaces / compatible with

A direct replacement for Siemens 3RT2028 models with 24V DC coils, integrated surge suppression, and 2 NO/2 NC auxiliary contacts. Verify specifications before replacing.

Technical note

Expert tip

The integrated diode provides effective coil de-energization transient suppression, making it suitable for applications where sensitive electronic components are nearby.

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Frequently asked questions

What is the auxiliary contact configuration on the Siemens 3RT2028-1FB44-3MA0?

The Siemens 3RT2028-1FB44-3MA0 features 2 normally open (NO) and 2 normally closed (NC) auxiliary contacts. It also includes a captive auxiliary switch for reliable operation.